using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using ChartForgeX.Core;
using ChartForgeX.Primitives;
using ChartForgeX.Rendering;
using ChartForgeX.Themes;
using ChartForgeX.Topology;
using ChartForgeX.Typography;
using ChartForgeX.VisualArtifacts;
using ChartForgeX.VisualBlocks;

// Optional exact gallery typography; copy the gallery's fonts directory beside this program.
FontRegistry.Register("CFX Proof Carlito", "fonts/Carlito-Regular.ttf", 400);
FontRegistry.Register("CFX Proof Carlito", "fonts/Carlito-Bold.ttf", 700);
var mode = VisualThemeMode.Light;
var theme = VisualTheme.Graphite();
var model = RangeBarRecipe.Create("endpoint-labels", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(800, 440)), theme, mode,
    new VisualFrame("Minimum and maximum delivery times", "Start and end captions retain the authored interval order", showLegend: null, showSurface: false), FontSpec.FromFamily("CFX Proof Carlito"));
var prepared = model.Prepare(context);
File.WriteAllText("visual.svg", prepared.ToSvg());
File.WriteAllBytes("visual.png", prepared.ToPng());
File.WriteAllText("visual.html", prepared.ToArtifact("example", VisualArtifactKind.Chart).ToHtmlPage());

/// <summary>Builds delivery-time intervals, grouped comparisons and endpoint labels.</summary>
public static class RangeBarRecipe {
    /// <summary>Creates the selected range-bar example with vertical or horizontal intervals.</summary>
    public static Chart Create(string variant = "wide", VisualThemeMode mode = VisualThemeMode.Light) {
        if (variant is not ("wide" or "compact" or "sparse" or "options" or "compact-options" or "horizontal" or "compact-horizontal"
            or "endpoint-labels" or "compact-endpoint-labels" or "horizontal-endpoint-labels" or "compact-horizontal-endpoint-labels"))
            throw new ArgumentOutOfRangeException(nameof(variant));
        Chart chart;
        if (variant is "endpoint-labels" or "compact-endpoint-labels" or "horizontal-endpoint-labels" or "compact-horizontal-endpoint-labels")
            chart = EndpointLabels(variant);
        else if (variant is "options" or "compact-options" or "horizontal" or "compact-horizontal")
            chart = GroupedIntervals(variant);
        else {
            var count = variant == "sparse" ? 2 : 5;
            var intervals = Enumerable.Range(1, count).Select(index => new ChartInterval(index, 20 + index * 2, 40 + index * 4));
            var range = ChartSeries.CreateRangeBar(new ChartSeriesId("range"), "Range", intervals);
            chart = Chart.Create().WithXLabels("Standard", "Express", "Premium", "Bulk", "Return").AddSeries(range);
        }
        return chart.WithValueFormat(ChartValueFormat.Number("0.##", CultureInfo.InvariantCulture));
    }

    private static Chart GroupedIntervals(string variant) {
        var horizontal = variant is "horizontal" or "compact-horizontal";
        var expected = ChartSeries.CreateRangeBar(new ChartSeriesId("expected"), "Expected", new[] {
            new ChartInterval(1, 20, 40), new ChartInterval(2, 10, 30), new ChartInterval(3, 15, 35), new ChartInterval(4, 25, 50)
        });
        var observed = ChartSeries.CreateRangeBar(new ChartSeriesId("observed"), "Observed", new[] {
            new ChartInterval(1, 22, 45), new ChartInterval(2, 32, 12), new ChartInterval(3, 18, 42), new ChartInterval(4, 28, 55)
        });
        var chart = Chart.Create().WithXLabels("Standard", "Express", "Premium", "Bulk").AddSeries(expected).AddSeries(observed)
            .ConfigureRangeBar(options => options.Orientation = horizontal ? ChartOrientation.Horizontal : ChartOrientation.Vertical)
            .WithBarStyle(ChartBarStyle.SegmentedCapsule).WithDataLabels();
        if (horizontal) chart.WithXAxis("Delivery time (minutes)").WithYAxis("Service");
        else chart.WithYAxis("Delivery time (minutes)");
        return chart;
    }

    private static Chart EndpointLabels(string variant) {
        var horizontal = variant.Contains("horizontal");
        var expected = ChartSeries.CreateRangeBar(new ChartSeriesId("expected"), "Expected", new[] {
            new ChartInterval(1, 15, 35), new ChartInterval(2, 10, 30), new ChartInterval(3, 25, 50)
        });
        var observed = ChartSeries.CreateRangeBar(new ChartSeriesId("observed"), "Observed", new[] {
            new ChartInterval(1, 20, 42), new ChartInterval(2, 32, 12), new ChartInterval(3, 30, 55)
        }).WithPointLabel(1, "Recorded express delivery");
        var chart = Chart.Create().WithXLabels("Standard", "Express", "Bulk").AddSeries(expected).AddSeries(observed)
            .ConfigureRangeBar(options => {
                options.Orientation = horizontal ? ChartOrientation.Horizontal : ChartOrientation.Vertical;
                options.LabelContent = ChartRangeBarLabelContent.Endpoints;
                options.EndpointLabelFormatter = label => label.FormattedValue + (label.Endpoint == ChartRangeBarEndpoint.Start ? " S" : " E");
            }).WithBarStyle(ChartBarStyle.Flat).WithDataLabels();
        (horizontal ? chart.Options.XAxis : chart.Options.YAxis).WithBounds(0, 70);
        if (horizontal) {
            chart.WithXAxis("Delivery time (minutes)").WithYAxis("Service");
            chart.ConfigureDataLabelStyle(style => style.WithFontSize(10));
        }
        else chart.WithYAxis("Delivery time (minutes)");
        return chart;
    }
}